We __________ walk or cycle to school.
should
We ________ use the public transport.
shouldn't
We ______________ plant more trees.
should
We _________ turn off the light when we leave a room.
should
We _________ recycle bottles and cans.
should
We _________ replace old bulbs with LED.
should
We __________ cut down trees.
shouldn't
We_________ use recycled bags.
should
We ___________ waste water.
shouldn't